It's nice to see someone else saying the same thing I was saying to a newsgroup in 1999 about safe surfing needing active supervision more than filtering software. My favorite lines from Sam Sugar's article:
"Protecting children who aren't actively looking for sexual material is as simple as good parenting."
"When minors are interested enough in sex to look for it online, the rules change. You can't treat pornography as something they're innocently stumbling into, and you can't expect them to ignore the mental and physical aspects of puberty until they're legal adults."